Organizing under the sink presents particular challenges: it's a dark area cramped with kitchen plumbing, and anything stored there is first in the line of fire if said plumbing gives out. Since these aren't the most fun conditions under which to organize, we often ignore this space, preferring to shove spray bottles and rubber gloves to the back and shut the door. Ann Marie, who keeps a blog called An Old Fashioned Girl, is clearly a better person.
The building blocks of Ann Marie's under-the-sink organizing system are rubber totes, and for good reason: they're waterproof, easily washable, and keep like items together.
Her next trick is copious and precise labeling. What's the point of "a place for everything and everything in its place" if you forget where that place is? Labeling makes this easy.